Contrasting effects of biochar and hydrothermally treated coal gangue on leachability, bioavailability, speciation and accumulation of heavy metals by rapeseed in copper mine tailings

Munir, Mehr Ahmed Mujtaba; Liu, Guijian; Yousaf, Balal; Mian, Manik; Ali, Muhammad Ubaid; Ahmed, Rafay; Cheema, Ayesha Imtiyaz; Naushad, Mu.

doi:10.1016/j.ecoenv.2020.110244

Cited by 57 publications

(19 citation statements)

References 80 publications

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“…The correlation analysis (Figure S5) and linear regression (Table 4) between BCF and TFs with different fractions of Pb and Cd in the soil suggested that the increase in residual fraction and decrease in water‐soluble (FA) and reducible (FB) are directly related to bioaccumulation and translocation of Pb and Cd. The decrease in the translocation factor of Pb and Cd in all MPs after biochar addition is consistent with previous studies (Liu et al, 2020; Munir et al, 2020; Naveed et al, 2020). The negative correlation between available phosphorus and translocation factor suggested the possibility of the formation of insoluble complexes of Pb and Cd such as chloropyromorphite (Pb 5 (PO 4 ) 3 Cl) and hydroxyl pyromorphite (Pb 5 (PO 4 ) 3 OH), which restrict the metal translocation from roots to shoots (Nigam et al, 2019).…”

Section: Discussionsupporting

confidence: 92%

Biochar amendment reduced the risk associated with metal uptake and improved metabolite content in medicinal herbs

Nigam

Khare

Ahsan

et al. 2021

Physiologia Plantarum

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Contaminations of heavy metals such as lead (Pb) and cadmium (Cd) in medicinal plants (MPs) not only restrict their safe consumption due to health hazards but also lower their productivity. Biochar amendments in the soil are supposed to immobilize the toxic metals, improve the soil quality, and agricultural productivity. However, the impact of biochar on growth attributes, metal accumulation, pharmacologically active compounds of MPs, and health risk is less explored. An experiment was performed on three medicinal plants [Bacopa monnieri (L.), Andrographis paniculata (Burmf.) Nees, and Withania somnifera (L.)] grown in a greenhouse in soil co‐contaminated with Pb and Cd (at two concentrations) without and with biochar amendments (2% and 4% application rates). The fractionation of Pb and Cd, plant growth parameters, stress enzymes, photosynthetic capacity, pharmacologically active compounds, nutrient content, uptake and translocation of metals, antioxidant activities, and metabolite content were examined in the three MPs. The accumulation of Pb and Cd varied from 3.25–228 and 1.29–20.2 mg kg−1, respectively, in the three MPs, while it was reduced to 0.08–18 and 0.03–6.05 mg kg−1upon biochar treatments. Plants grown in Pb and Cd co‐contaminated soil had reduced plant biomass (5%–50% depending on the species) compared to control and a deleterious effect on photosynthetic attributes and protein content. However, biochar amendments significantly improved plant biomass (21%–175%), as well as photosynthesis attributes, chlorophyll, and protein contents. Biochar amendments in Pb and Cd co‐contaminated soil significantly reduced the health hazard quotient (HQ) estimated for the consumption of these medicinal herbs grown on metal‐rich soil. An enhancement in secondary metabolite content and antioxidant properties was also observed upon biochar treatments. These multiple beneficial effects of biochar supplementation in Pb and Cd co‐contaminated soil suggested that a biochar amendment is a sustainable approach for the safe cultivation of MPs.

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Section: Discussionsupporting

confidence: 92%

Biochar amendment reduced the risk associated with metal uptake and improved metabolite content in medicinal herbs

Nigam

Khare

Ahsan

et al. 2021

Physiologia Plantarum

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“…Soil amendments, such as manure and phosphate-fertilizers can be both effective and cheaper [20,26] and therefore more suited for poorer countries. Soil amendments such as manure, compost and phosphorous-based fertilizers have been proposed and shown to immobilize HMs in soil and reduce plant uptake [4,[22][23][24]27,28]. Organic amendments such as animal manure immobilize HMs through chelation, formation of insoluble complexes, adsorption on charged functional groups and cation exchange [4,22,29].…”

Section: Introductionmentioning

confidence: 99%

Lead, Zinc and Cadmium Accumulation, and Associated Health Risks, in Maize Grown near the Kabwe Mine in Zambia in Response to Organic and Inorganic Soil Amendments

Mwilola

Mukumbuta

Shitumbanuma

et al. 2020

IJERPH

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Health risks due to heavy metal (HM) contamination is of global concern. Despite concerns of high levels of HMs in soils near Kabwe mine in Zambia, edible crop production is common, posing potential health risks. This study assessed the potential of chicken manure (CM), triple superphosphate (TSP) and a blended fertilizer (BF; consisting of Nitrogen, Phosphorous and Potassium (NPK) fertilizer and composted chicken manure) to reduce lead (Pb), zinc (Zn) and cadmium (Cd) in soils and their accumulation in maize grown near the Kabwe mine. Maize was grown to maturity and its HM concentrations and associated health risk indices were calculated. All soil amendments decreased bioavailable soil Pb concentrations by 29–36%, but only CM decreased Zn, while the amendments increased or had no effect on Cd concentrations compared to the control. The amendments reduced Pb (>25%) and Zn concentrations (>18%) in the maize stover and grain. However, Cd concentrations in maize grain increased in the BF and TSP treatments. Bioaccumulation factors showed that Cd had the highest mobility from the soil into maize stover and grain, indicating the need for greater attention on Cd in Kabwe despite its apparently lower soil concentration compared to Pb and Zn. The hazard quotients for Pb and Cd were much greater than one, indicating a high risk of possible exposure to toxic levels by people consuming maize grain grown in this area. This study demonstrated the significant potential of manure and phosphate-based amendments to reduce Pb and Zn, and to some extent Cd, uptake in maize grain and consequently reduce associated health risks.

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“…These heavy metals spread through the food web, with potential toxic effects on animals, plants, and humans. Such toxicity is of particular concern (Munir et al 2020). Therefore, while seeking better beneficiation technologies to reduce the heavy metal content in tailings, it is urgent to find a more appropriate treatment and disposal method for the large amount of tailings that has already been produced.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the resource utilization of CTs is mainly reflected in the use of construction materials for buildings and adsorbent material for sewage treatment (Esmaeili et al 2020;Munir et al 2020;Zeng et al 2021). The utilization of CTs as building materials, such as bricks and supplementary cementitious materials, has achieved the resource utilization of CTs to a certain extent, but the technical aspects require further improvements.…”

Section: Introductionmentioning

confidence: 99%

Novel scheme for synergistic purification of copper mine tailings and orthophosphate

Zhou

Zhang

2022

Water Science and Technology

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Copper tailings (CTs) and orthophosphate are major environmental pollutants. CTs cause severe heavy metal pollution, and orthophosphate is one of the primary causes of water body eutrophication. This study aimed to alleviate heavy metal pollution by CTs and the eutrophication of water caused by orthophosphate. To this end, a 50 mg/L orthophosphate was used as a chemically active leaching solution and passed through a CT soil column. The tail water was then collected. Laboratory leaching tests showed that the thermally modified CTs effectively trapped orthophosphate, and the orthophosphate content in the leachate was 0.15 mg/L. After chemical washing, Cu2+, Cd2+, and Zn2+ were tested in the tail water, and the heavy metal ions in the tail water were removed using an advanced treatment technology. After treatment with 20.0 g/L water hyacinth biochar (WHBC), the removal rates (R%) of Cu2+, Cd2+, and Zn2+ were 99.48, 94.94, and 94.84%, respectively. These results demonstrated that this novel scheme for the synergistic purification of CTs and orthophosphate was feasible in the laboratory. This study provides new theoretical guidance and technical support for CT soil heavy metal remediation and water eutrophication treatment.

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Contrasting effects of biochar and hydrothermally treated coal gangue on leachability, bioavailability, speciation and accumulation of heavy metals by rapeseed in copper mine tailings

Cited by 57 publications

References 80 publications

Biochar amendment reduced the risk associated with metal uptake and improved metabolite content in medicinal herbs

Biochar amendment reduced the risk associated with metal uptake and improved metabolite content in medicinal herbs

Lead, Zinc and Cadmium Accumulation, and Associated Health Risks, in Maize Grown near the Kabwe Mine in Zambia in Response to Organic and Inorganic Soil Amendments

Novel scheme for synergistic purification of copper mine tailings and orthophosphate

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